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mm: memory_hotplug: override memmap_on_memory when hugetlb_free_vmemmap=on 

Optimizing HugeTLB vmemmap pages is not compatible with allocating memmap
on hot added memory.  If "hugetlb_free_vmemmap=on" and
memory_hotplug.memmap_on_memory" are both passed on the kernel command
line, optimizing hugetlb pages takes precedence.  However, the global
variable memmap_on_memory will still be set to 1, even though we will not
try to allocate memmap on hot added memory.

Also introduce mhp_memmap_on_memory() helper to move the definition of
"memmap_on_memory" to the scope of CONFIG_MHP_MEMMAP_ON_MEMORY.  In the
next patch, mhp_memmap_on_memory() will also be exported to be used in
hugetlb_vmemmap.c.

Link: https://lkml.kernel.org/r/20220512041142.39501-3-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Acked-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kees Cook <keescook@chromium.org>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Xiongchun Duan <duanxiongchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Muchun Song 2022-05-13 16:48:56 -07:00 committed by Andrew Morton
parent 0effdf461c
commit 6e02c46b4d
1 changed files with 26 additions and 6 deletions
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32
mm/memory_hotplug.c
View File

@ -42,14 +42,36 @@
#include "internal.h"
#include "shuffle.h"
#ifdef CONFIG_MHP_MEMMAP_ON_MEMORY
static int memmap_on_memory_set(const char *val, const struct kernel_param *kp)
{
if (hugetlb_optimize_vmemmap_enabled())
return 0;
return param_set_bool(val, kp);
}
static const struct kernel_param_ops memmap_on_memory_ops = {
.flags = KERNEL_PARAM_OPS_FL_NOARG,
.set = memmap_on_memory_set,
.get = param_get_bool,
};
/*
* memory_hotplug.memmap_on_memory parameter
*/
static bool memmap_on_memory __ro_after_init;
#ifdef CONFIG_MHP_MEMMAP_ON_MEMORY
module_param(memmap_on_memory, bool, 0444);
module_param_cb(memmap_on_memory, &memmap_on_memory_ops, &memmap_on_memory, 0444);
MODULE_PARM_DESC(memmap_on_memory, "Enable memmap on memory for memory hotplug");
static inline bool mhp_memmap_on_memory(void)
{
return memmap_on_memory;
}
#else
static inline bool mhp_memmap_on_memory(void)
{
return false;
}
#endif
enum {
@ -1289,9 +1311,7 @@ bool mhp_supports_memmap_on_memory(unsigned long size)
* altmap as an alternative source of memory, and we do not exactly
* populate a single PMD.
*/
return memmap_on_memory &&
!hugetlb_optimize_vmemmap_enabled() &&
IS_ENABLED(CONFIG_MHP_MEMMAP_ON_MEMORY) &&
return mhp_memmap_on_memory() &&
size == memory_block_size_bytes() &&
IS_ALIGNED(vmemmap_size, PMD_SIZE) &&
IS_ALIGNED(remaining_size, (pageblock_nr_pages << PAGE_SHIFT));
@ -2076,7 +2096,7 @@ static int __ref try_remove_memory(u64 start, u64 size)
* We only support removing memory added with MHP_MEMMAP_ON_MEMORY in
* the same granularity it was added - a single memory block.
*/
if (memmap_on_memory) {
if (mhp_memmap_on_memory()) {
nr_vmemmap_pages = walk_memory_blocks(start, size, NULL,
get_nr_vmemmap_pages_cb);
if (nr_vmemmap_pages) {